How do i log in or register the program?

You activate Hindenburg with your registration key. You find the key in the mail that was sent to you when you purchased. If, for some reason, you can not locate the mail, the maybe it is in your junk or spam mail folder.

When you have the key, then goto

Mac: Hindenburg / Registration keyWindows: Help / Registration Key

Input the mail that was used for purchase and the registration key. Press OK